Editions can be marked as being in beta

www.agileplannerapp.com/boards/173808/cards/5418

As a GDS content designer
I want to show GOV.UK end users that a piece of
mainstream content is not yet the official source
and is still in beta
So that I can trial content with the public and
gather evidence to make it even better

cc: @fofr
Can we make this class name more semantic please. badge-orange doesn't mean much and it may change from orange in the future. Looking at other changes in this pull request, it seems more sense to me to change it to 'beta'?